Python - What Is Variable

What Is Variable

Q

What is variable in Python?

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A

A variable is symbolic name that can be assigned with a reference link to a data object resulted from an expression.

In Python, variables are not declared specifically for any data type. They can be used without declaration statements. For example, the following assignment statements defines variable "x" and assigned with an "int" object first, then changed to a "float" object:

>>> x = 1234
>>> x
1234
>>> x = 3.14159
>>> x
3.14159

Variable names must start with alphabetical letters or "_". For example, some invalid variable names are listed below:

3x 
"x"
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⇒Expressions, Variables and Assignment Statements

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2018-03-13, 252👍, 0💬

What Is Assignment Statement
What is Assignment Statement in Python? An Assignment Statement is associates a reference of a data object resulted from an expression to a variable or to an item in a list or dictionary. Assignment statement has the following syntax: variable = expression After the data object is assigned to a vari... 2018-03-13, 280👍, 0💬

What Is Variable
What is variable in Python? A variable is symbolic name that can be assigned with a reference link to a data object resulted from an expression. In Python, variables are not declared specifically for any data type. They can be used without declaration statements. For example, the following assignmen... 2018-03-13, 253👍, 0💬

What Is Expression
What Is an expression in Python? An expression in Python is a sequence of operations or method calls applied on data objects. An expression has two impacts when executed: Code statements of invoked methods get executed. This may create new data objects, update existing data objects, consume resource... 2018-03-13, 247👍, 0💬

Evaluation of Expressions
How expressions are evaluated in Python? Expressions are evaluated in Python based on precedence of each operation list below: Operator Description -------- ----------- (expressions...), [expressions...], {key: value...}, {expressions...} Binding or tuple display, list display, dictionary display, s... 2018-03-13, 230👍, 0💬

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